Back when we were in high-pitched school , “ bass voice - offs ” — contests where stripling with pumped up car stereo phone system would compete to see whose gondola could reach the loudest volume — were a really bragging deal . And apparently they still are , but now they ’re called dB ( as in decibel ) retarding force racing , at least agree to this article from Popular Science . The dB puff race car pictured at left hand has a Dodge Caravan with a 130,000 James Watt motorcar stereo system with 72 amplifier and nine subwoofers and needs 36 batteries for business leader . At maximum mass it can produce sounds loud enough to kill a soul . put this in the “ Portable Audio ” category might be a stretching , as the cable car is so heavy that it ca n’t really be driven .
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